TY  - RPRT
TI  - Smallpox: preparation without inoculation.
AU  - Kathleen Nelson
PY  - 2003
DO  - 10.1016/s0140-6736(03)14201-8
UR  - https://pubmed.ncbi.nlm.nih.gov/12947947/
ID  - 12947947
ER  -